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Forced expiratory volume in 1 s (FEV1) results in the RECOVER trial. FEV1 was measured at different points for the noninvasive intermittent positive pressure ventilation (NIPPV) + rehabilitation group (red triangles) and the rehabilitation group (blue squares). The change was significantly better in the NIPPV + rehabilitation group (p<0.02). Reproduced from [33] with permission from the publisher.
